基于恒星像点轨迹的星图填补
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摘要
数字天顶仪是一种通过拍摄星图进行定位的天文仪器,在采用数字天顶仪拍摄星图时,由于云层等外部因素会导致拍摄的星图存在星点缺失,直接影响到仪器的定位精度。为了提高仪器的实用性和对环境的适应性,本文推导了恒星像点轨迹,并提出了一种基于恒星像点轨迹的星图填补方法,该方法构建了缺失星图与相邻两幅星图之间的像点填补模型。实验数据表明,采用该方法能够对星图进行较好地填补,通过填补后的星图解算的定位误差在0.01″以内,使定位精度基本保持了不变。
Digital zenith camera is an astronomical instrument which is used to locate by taking star images.When taking a star image,there are star points missing in the star image due to external factors such as clouds,and the accuracy of positioning will be affected directly.In order to improve the practicability of the instrument and its adaptability to the environment,the stellar image point trajectory is derived and a star image filling method based on stellar image point trajectory is proposed.This method constructs a filling model between the missing star image and the adjacent two star images.The experimental data shows that the method can better fill the star image.The positioning error calculated by the filled star image is less than 0.001″.The positioning accuracy remains unchanged.
Digital zenith camera is an astronomical instrument which is used to locate by taking star images.When taking a star image,there are star points missing in the star image due to external factors such as clouds,and the accuracy of positioning will be affected directly.In order to improve the practicability of the instrument and its adaptability to the environment,the stellar image point trajectory is derived and a star image filling method based on stellar image point trajectory is proposed.This method constructs a filling model between the missing star image and the adjacent two star images.The experimental data shows that the method can better fill the star image.The positioning error calculated by the filled star image is less than 0.001″.The positioning accuracy remains unchanged.
引文
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[2]宋来勇.基于CCD/GPS垂线偏差测量理论算法研究[D].山东:山东科技大学,2012.SONG L Y.Research on Theory and Algorithm for Measuring of Vertical Deflections Based on CCD and GPS[D].Shandong:Shandong University of Science and Technology,2012.(in Chinese)
[3]HIRT C,SEEBER G.Accuracy analysis of vertical deflection data observed with the Hannover Digital Zenith Camera System TZK2-D[J].Springer,2008,8(2):347-356.
[4]KEREM H,RASIM D,Haluk Ozener.Digital zenith camera system for Astro-Geodetic applications in turkey[J].Journal of Geodesy and Geoinformation,2012,1(2):115-120.
[5]田立丽,郭金运,韩延本,等.我国的数字化天顶望远镜样机[J].科学通报,2014,59(12):1094-1099.TIAN L L,GUO J Y,HAN Y B,et al..Digital zenith telescope prototype of China[J].Chin.Sci.Bull,2014,59(12):1094-1099.(in Chinese)
[6]周召发,刘先一,张志利,等.基于数字天顶仪的双轴倾角仪研究[J].光子学报,2015,44(8):21-26.ZHOU ZH F,LIU X Y,ZHANG ZH L,et al..Research on two-axis tilt sensor based on digital zenith camera[J].Acta Photonica Sinica,2015,44(8):21-26.(in Chinese)
[7]王博,田立丽,王政,等.数字化天顶望远镜观测图像及数据处理[J].科学通报,2014,59(12):1100-1107.WANG B,TIAN L L,WANG ZH,et al..The image and data processing in digital zenith camera[J].Chin.Sci.Bull,2014,59(12):1100-1107.(in Chinese)
[8]施航,朱志刚.星敏感器星图处理研究[J].光学与广电技术,2014,12(6):58-60.SHI H,ZHU ZH G.Image processing of star sensor[J].Optics&Optoelectronics Technology,2014,12(6):58-60.(in Chinese)
[9]刘晓平,何士双.基于三角划分的多连通域图形匹配研究[J].工图图学学报,2010,31(1):61-66.LIU X P,HE SH SH.Research on graphics matching of multiply connected region based on triangulation[J].Journal of Engineering Graphics,2010,31(1):61-66.(in Chinese)
[10]张仁斌,王鹿,李钢.一种基于三角形的快速星图识别方法[J].仪器仪表学报,2009,10(30):170-173.ZHANG R B,WANG L,LI G.Quick star map identification algorithm based on triangle[J].Chinese Journal of Scientific Instrument,2009,10(30):170-173.(in Chinese)
[11]崔祥祥,王宏力,陈聪,等.星三角形识别中的选星策略及实现[J].中国惯性技术学报,2012,3(20):296-299.CUI X X,WANG H L,CHEN C,et al..Star selection strategy and realization in star triplet identification[J].Journal of Chinese Inertial Technology,2012,3(20):296-299.(in Chinese)
[12]HIRT C.Prediction of vertical deflections from highdegree spherical harmonic synthesis and residual terrain model data[J].Springs,2010,179-180.